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Vocal Folds
In humans, vocal cords, also known as vocal folds or voice reeds, are folds of throat tissues that are key in creating sounds through vocalization. The size of vocal cords affects the pitch of voice. Open when breathing and vibrating for speech or singing, the folds are controlled via the recurrent laryngeal branch of the vagus nerve. They are composed of twin infoldings of mucous membrane stretched horizontally, from back to front, across the larynx. They vibrate, modulating the flow of air being expelled from the lungs during phonation. The 'true vocal cords' are distinguished from the 'false vocal folds', known as vestibular folds or ''ventricular folds'', which sit slightly superior to the more delicate true folds. These have a minimal role in normal phonation, but can produce deep sonorous tones, screams and growls. The length of the vocal fold at birth is approximately six to eight millimeters and grows to its adult length of eight to sixteen millimeters by adolescence. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phonation
The term phonation has slightly different meanings depending on the subfield of phonetics. Among some phoneticians, ''phonation'' is the process by which the vocal folds produce certain sounds through quasi-periodic vibration. This is the definition used among those who study laryngeal anatomy and physiology and speech production in general. Phoneticians in other subfields, such as linguistic phonetics, call this process '' voicing'', and use the term ''phonation'' to refer to any oscillatory state of any part of the larynx that modifies the airstream, of which voicing is just one example. Voiceless and supra-glottal phonations are included under this definition. Voicing The phonatory process, or voicing, occurs when air is expelled from the lungs through the glottis, creating a pressure drop across the larynx. When this drop becomes sufficiently large, the vocal folds start to oscillate. The minimum pressure drop required to achieve phonation is called the phonation threshold ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laryngoscope
Laryngoscopy () is endoscopy of the larynx, a part of the throat. It is a medical procedure that is used to obtain a view, for example, of the vocal folds and the glottis. Laryngoscopy may be performed to facilitate tracheal intubation during general anaesthesia or cardiopulmonary resuscitation or for surgery, surgical procedures on the larynx or other parts of the upper respiratory tract#Respiratory tree, tracheobronchial tree. Direct laryngoscopy Direct laryngoscopy is carried out (usually) with the patient lying on his or her back; the laryngoscope is inserted into the mouth on the right side and flipped to the left to trap and move the tongue out of the line of sight, and, depending on the type of blade used, inserted either anterior or posterior to the epiglottis and then lifted with an upwards and forward motion ("away from you and towards the roof "). This move makes a view of the glottis possible. This procedure is done in an operation theatre with full preparation for r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lamina Propria
The lamina propria is a thin layer of connective tissue that forms part of the moist linings known as mucous membranes or mucosae, which line various tubes in the body, such as the respiratory tract, the gastrointestinal tract, and the urogenital tract. The lamina propria is a thin layer of loose (areolar) connective tissue, which lies beneath the epithelium, and together with the epithelium and basement membrane constitutes the mucosa. As its Latin name indicates, it is a characteristic component of the mucosa, or the mucosa's "own special layer." Thus, the term mucosa or mucous membrane refers to the combination of the epithelium and the lamina propria. The connective tissue of the lamina propria is loose and rich in cells. The cells of the lamina propria are variable and can include fibroblasts, lymphocytes, plasma cells, macrophages, eosinophilic leukocytes, and mast cells. It provides support and nutrition to the epithelium, as well as the means to bind to the underl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Keratin
Keratin () is one of a family of structural fibrous proteins also known as ''scleroproteins''. Alpha-keratin (α-keratin) is a type of keratin found in vertebrates. It is the key structural material making up scales, hair, nails, feathers, horns, claws, hooves, and the outer layer of skin among vertebrates. Keratin also protects epithelial cells from damage or stress. Keratin is extremely insoluble in water and organic solvents. Keratin monomers assemble into bundles to form intermediate filaments, which are tough and form strong unmineralized epidermal appendages found in reptiles, birds, amphibians, and mammals. Excessive keratinization participate in fortification of certain tissues such as in horns of cattle and rhinos, and armadillos' osteoderm. The only other biological matter known to approximate the toughness of keratinized tissue is chitin. Keratin comes in two types, the primitive, softer forms found in all vertebrates and harder, derived forms found only amon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Death Growl
A death growl, or simply growl, is an extended vocal technique usually employed in extreme styles of music, particularly in death metal and other extreme subgenres of heavy metal music. Death growl vocals are sometimes criticized for their "ugliness", but their unintelligibility contributes to death metal's abrasive style and often dark and obscene subject matter.Sharpe-Young, Garry. ''Death Metal'', Definition Death metal, in particular, is associated with growled vocals; it tends to be lyrically and thematically darker and more morbid than other forms of metal, and features vocals which attempt to evoke chaos, death, and misery by being "usually very deep, guttural, and unintelligible." Natalie Purcell notes, "Although the vast majority of death metal bands use very low, beast-like, almost indiscernible growls as vocals, many also have high and screechy or operatic vocals, or simply deep and forcefully-sung vocals."Purcell, Natalie J. ''Death Metal Music:The Passion and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Screaming (music)
Screaming is an extended vocal technique that is popular in "aggressive" music genres such as heavy metal, punk rock, and noise music and others. It is common in the more extreme subgenres of heavy metal, such as death and black metal as well as many other subgenres. Genres Classical and experimental music Although screams are often suggested in stories performed in the grand opera tradition, they were never performed literally, always being sung. The first significant example of an actual scream in an opera is in Alban Berg's ''Wozzeck'' (1922), where the eponymous character screams "Murder! Murder!" in the fourth scene of Act III. Even more strikingly, Berg's unfinished ''Lulu'', written mainly in 1934, features a blood-curdling scream as the heroine is murdered by Jack the Ripper in the closing moments of the final scene. In Mascagni's 1890 ''Cavalleria rusticana'' the final line "They've murdered Turiddu!" is spoken, not sung, and often accompanied by a scream. Othe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tuvan Throat Singing
Tuvan throat singing, the main technique of which is known as ''khoomei'' ( tyv, хөөмей, xöömej, mn, хөөмий; ᠬᠦᠭᠡᠮᠡᠢ, khöömii, russian: хоомей, Chinese: 呼麦, pinyin: ''hūmài''), includes a type of overtone singing practiced by people in Tuva, Mongolia, and Siberia. In 2009, it was included in the Representative List of the Intangible Cultural Heritage of Humanity of UNESCO. The term ''hömey'' / ''kömey'' means ''throat'' and ''larynx'' in different Turkic languages. That could be borrowed from Mongolian ''khooloi'', which means throat as well, driven from Proto-Mongolian word ''*koɣul-aj''. Overview In Tuvan throat singing, the performer produces a fundamental pitch and—simultaneously—one or more pitches over that. The history of Tuvan throat singing reaches far back. Many male herders can throat sing, but women have begun to practice the technique as well. The popularity of throat singing among Tuvans seems to have arisen as a re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tibetan Chant
The music of Tibet reflects the cultural heritage of the trans-Himalayan region centered in Tibet, but also known wherever ethnic Tibetan groups are found in Nepal, Bhutan, India and further abroad. The religious music of Tibet reflects the profound influence of Tibetan Buddhism on the culture. The new-age 'singing bowl' music marketed in the West as 'Tibetan music' is of 1970s US origin. History Western research into the history of Tibetan music has often focused more on religious than secular musics. It has been suggested that Tibetan religious music may have been strongly influenced by West-Asian musics, including those of pre-Muslim Persia (and perhaps even of Byzantium). It has also been suggested that the landscape – and in particular the resonances of caves, with their natural percussive sounding stones - exerted a formative influence on the overtone singing found in Tibetan Buddhist chant (and plausibly also in prehistoric shamanic invocations), which is produce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ligament
A ligament is the fibrous connective tissue that connects bones to other bones. It is also known as ''articular ligament'', ''articular larua'', ''fibrous ligament'', or ''true ligament''. Other ligaments in the body include the: * Peritoneal ligament: a fold of peritoneum or other membranes. * Fetal remnant ligament: the remnants of a fetal tubular structure. * Periodontal ligament: a group of fibers that attach the cementum of teeth to the surrounding alveolar bone. Ligaments are similar to tendons and fasciae as they are all made of connective tissue. The differences among them are in the connections that they make: ligaments connect one bone to another bone, tendons connect muscle to bone, and fasciae connect muscles to other muscles. These are all found in the skeletal system of the human body. Ligaments cannot usually be regenerated naturally; however, there are periodontal ligament stem cells located near the periodontal ligament which are involved in the adult regener ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vocalis Muscle
The thyroarytenoid muscle is a broad, thin muscle that forms the body of the vocal fold and that supports the wall of the ventricle and its appendix. It functions to shorten the vocal folds. Structure It arises in front from the lower half of the angle of the thyroid cartilage, and from the middle cricothyroid ligament. Its fibers pass backward and laterally, to be inserted into the base and anterior surface of the arytenoid cartilage. Parts The lower and deeper fibers of the muscle can be differentiated as a triangular band which is inserted into the vocal process of the arytenoid cartilage, and into the adjacent portion of its anterior surface; it is termed the ''Vocalis'', and lies parallel with the vocal ligament, to which it is adherent.Frank H. Netter, MD "Atlas of Human anatomy", 7th Edition, 2019, Plate 91, superior view The vocal muscle is the upper portion of the thyroarytenoid muscle which is primarily involved in producing speech. A considerable number of the fibers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Epithelium
Epithelium or epithelial tissue is one of the four basic types of animal tissue, along with connective tissue, muscle tissue and nervous tissue. It is a thin, continuous, protective layer of compactly packed cells with a little intercellular matrix. Epithelial tissues line the outer surfaces of organs and blood vessels throughout the body, as well as the inner surfaces of cavities in many internal organs. An example is the epidermis, the outermost layer of the skin. There are three principal shapes of epithelial cell: squamous (scaly), columnar, and cuboidal. These can be arranged in a singular layer of cells as simple epithelium, either squamous, columnar, or cuboidal, or in layers of two or more cells deep as stratified (layered), or ''compound'', either squamous, columnar or cuboidal. In some tissues, a layer of columnar cells may appear to be stratified due to the placement of the nuclei. This sort of tissue is called pseudostratified. All glands are made up of epithe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rima Glottidis
The rima glottidis is the opening between the two true vocal cords anteriorly, and the two arytenoid cartilages posteriorly. It is part of the larynx. Anatomy The rima glottidis is the narrowest part of larynx. It is longer (~23 mm) in males than in females (17-18 mm). The rima glottidis is an aperture between the two true vocal cords anteriorly, and the bases and vocal process of the two arytenoid cartilages posteriorly. It is therefore described as subdivided into two parts: the larger anterior part between the vocal folds (intermembranous part, or glottis vocalis), and the smaller posterior part between arytenoid cartilages (intercartilaginous part, glottis respiratoria, intercartilaginous glottis, respiratory glottis, or interarytenoid space). It is limited posteriorly by an interarytenoid fold of mucous membrane. Function The rima glottidis is closed by the lateral cricoarytenoid muscles and the arytenoid muscle, and opened by the posterior cricoarytenoid muscles. All ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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